With regard to political theory, the difference between Hobbes and myself, which is the subject of your inquiry, consists in this, that I always preserve the natural right in its entirety [ego naturale jus semper sartum tectum conservo], and I hold that the sovereign power in a State has right over a subject only in proportion to the excess of its power over that of a subject.

Verres, against whom Tully so much inveighs, in winter he never was extra tectum vix extra lectum, never almost out of bed, [1419] still wenching and drinking; so did he spend his time, and so do myriads in our days.

In 1973 (Science, Vol. 181, p. 1053) I showed that while the tectum was needed to react to moving prey, another visual area processed stationary edges, allowing frogs to dodge stationary barriers and to avoid tumbling into holes in the ground.